Approved: 2020-06-02 Measurement System Identification: NASA TECHNICAL STANDARD NASA-STD-8739.14 National Aeronautics and Space Administration Approved: 2020-06-02 Superseding NASA-STD-6008 NASA FASTENER PROCUREMENT, RECEIVING INSPECTION, AND STORAGE PRACTICES FOR NASA MISSION HARDWARE MEASUREMENT SYSTEM IDENTIFICATION: METRIC/SI (ENGLISH) APPROVED FOR PUBLIC RELEASE – DISTRIBUTION IS UNLIMITED
16
Embed
NASA FASTENER PROCUREMENT, RECEIVING INSPECTION, AND ...
This document is posted to help you gain knowledge. Please leave a comment to let me know what you think about it! Share it to your friends and learn new things together.
Transcript
Approved: 2020-06-02 Measurement System Identification:
NASA TECHNICAL STANDARD
NASA-STD-8739.14
National Aeronautics and Space Administration
Approved: 2020-06-02 Superseding NASA-STD-6008
NASA FASTENER PROCUREMENT, RECEIVING INSPECTION,
AND STORAGE PRACTICES FOR NASA MISSION HARDWARE
MEASUREMENT SYSTEM IDENTIFICATION:
METRIC/SI (ENGLISH)
APPROVED FOR PUBLIC RELEASE – DISTRIBUTION IS UNLIMITED
NASA-STD-8739.14 – 2020-06-02
2 of 16
DOCUMENT HISTORY LOG
Status
Document
Revision
Approval
Date
Description
Baseline 2020-06-02 Initial Release
(Supersedes NASA Fastener Standard NASA-STD-6008).
NASA-STD-8739.14 – 2020-06-02
3 of 16
FOREWORD
This standard is published by the National Aeronautics and Space Administration (NASA) to
provide uniform technical requirements for processes, procedures, practices, and methods that
have been endorsed as standard for NASA programs and projects.
Fastener control consists of practices related to the procurement, receiving inspection, quality data
control, and storage of fasteners.
This standard defines fastener control requirements for NASA mission hardware and is applicable
when invoked by higher level requirements documents, such as by NASA Center quality management
system documents, by Program safety and mission assurance plans, by Project mission assurance plans,
or in procurements such as purchase orders and contracts. NPR 8735.2, Management of Government
Quality Assurance Functions for NASA Contracts, establish that the requirements herein are part of
the Agency’s quality requirements baseline. See NPR 8735.2 for applicability statements.
Requests for information, corrections, or additions to this standard should be submitted to the
4.4.2.2 Fasteners shall be procured in homogeneous lots.
4.4.2.3 Commingling of lots shall not occur in order to ensure lot traceability.
4.4.2.4 The criteria for complete traceability of each fastener lot shall include all
of the following:
a. Documentation showing all transfers of custody from the original raw material
manufacturer through the original part manufacturer, including unique lot/heat numbers.
b. Documentation for all transfers of custody from the original part manufacturer to any
intermediate manufacturers and distributors and the final supplier.
Note: Traceability documentation that does not meet all of the criteria for
complete traceability is considered incomplete traceability.
4.4.2.5 Traceability documentation shall be maintained by the hardware
developer.
Note: Bolts are often marked with identifying characteristics including the material
symbol, manufacturer’s symbol, and lot number as space allows to facilitate traceability.
4.4.3 Certificate of Conformance (CoC)
4.4.3.1 Level I, II and III fasteners shall be procured with a Certificate of
Conformance (CoC) that references the applicable technical specifications and the
supplier.
4.4.4 Manufacturer’s Test Report (MTR)
4.4.4.1 Level I and II fasteners shall be procured with a Manufacturer’s Test
Report (MTR). The MTR is optional for level III fasteners
4.5 Receiving Inspection
4.5.1 Fastener lots shall have receiving inspection and testing performed by an entity whose
quality management system is in compliance with, or registered to, an appropriate ISO or
equivalent standard (e.g., ISO 17025:2017, General Requirements for the Competence of Testing
and Calibration Laboratories, ISO 9001:2015, AS9100D, etc.).
4.5.2 Fastener lots shall be verified by inspection and tests as required in this section and
summarized in Table 1. When these inspections and tests are performed on a sampling basis, the
required sampling size (A, B, or C) is identified in Table 1 and the corresponding sampling
quantity is called out in Table 2.
Note: These inspections/tests are performed upon receipt of the fasteners and is in
addition to those performed by the fastener manufacturer. Their purpose is to verify the
quality of the fastener lot and the integrity of the delivered documentation.
NASA-STD-8739.14 – 2020-06-02
Page 14 of 16
4.5.3 Fastener lot acceptance criteria for inspections and tests shall be zero failures.
4.5.4 Dimensional Inspection
4.5.4.1 All Level I threaded fasteners shall be inspected in accordance with the
System 22 criteria of ASME B1.3−2007, Screw Thread Gaging Systems for
Acceptability: Inch and Metric Screw Threads (UN, UNR, UNJ, M, and MJ).
4.5.4.2 Level II and III threaded fasteners shall have dimensional inspection
performed on a sampling basis in accordance with the System 21 or 22 criteria of
ASME B1.3-2007.
4.5.5 Visual Inspection for Finish
4.5.5.1 Visual inspection for finish (e.g. dry film lubricant, plating) shall be
performed on a sampling basis on level I, II, and III fasteners in accordance with
the applicable specification. The applicable finish specification will include
inspection requirements such as magnification, environment and inspection
criteria.
4.5.6 Visual Inspection for Lot Uniformity
Visual inspection shall be performed on all level I, II, and III fasteners at 1X magnification,
verifying the fasteners are uniform in appearance, and free from rust, scale, seams, bursts,
voids, nicks, gouges, and burrs.
4.5.7 Chemical Analysis
4.5.7.1 Chemical analysis shall be performed on a sampling basis for level II
fasteners that have been procured from a nonqualified supplier or have incomplete
traceability.
4.5.7.2 For the case of level II fasteners that are procured through a nonqualified
supplier and do not have complete traceability, chemical analysis shall be
performed using a quantitative technique that allows comparison to the
composition ranges specified in the controlling material specification. (reference
Table 1, footnote 3)
Note: Chemical analysis is used to verify the integrity of the fastener lot and
delivered documentation when procuring through a nonqualified supplier or to
provide material identification when the traceability paperwork is incomplete.
Level I fasteners require qualified suppliers and complete traceability, additional
chemical analysis is not required. Chemical analysis is not required for level III
fasteners.
Note: Optical Emission Spectroscopy (OES) is the preferred test method for quantitative
elemental analysis. Semi-quantitative methods include X-ray Fluorescence (XRF) and
NASA-STD-8739.14 – 2020-06-02
Page 15 of 16
Energy Dispersive Spectroscopy (EDS), and may be used to verify the correct alloy but
do not provide a sufficient level of accuracy to satisfy this requirement.
4.5.8 Tensile Testing
4.5.8.1 Tensile testing shall be performed on a sampling basis for level II threaded
fasteners such as bolts, screws, nuts, and nut plates that have been procured from a
nonqualified suppliers or have incomplete traceability.
4.5.8.2 Tensile testing shall be performed in accordance with one of the following
standards:
a. NASM1312-8, Fastener Test Methods, Method 8, Tensile Strength − Rev 2
b. NAM1312-108, Fastener Test Methods, Metric, Method 108, Tensile Strength − Rev 1
c. ASTM F606/F606M-16, Standard Test Methods for Determining the Mechanical
Properties of Externally and Internally Threaded Fasteners, Washers, Direct Tension
Indicators, and Rivets
4.5.8.3 Tensile test reports shall identify the location of the tensile break, the
ultimate load/strength, and the specification minimum and maximum values.
Note: Load extension curves are not required. Level II fasteners that are smaller than
#10 or shorter than 2 times their diameter may need to be procured through a qualified
supplier with complete traceability, since tensile testing at receiving inspection may not
be possible.
4.6 Handling, Packaging, and Storage
4.6.1 Fasteners shall be handled, packaged, and stored in a manner designed to prevent
damage. This will include environmental controls for temperature, humidity, and contamination.
4.6.2 Fasteners shall be handled, packaged, and stored in a manner designed to prevent
commingling of lots.
4.6.3 Fasteners shall be stored in a controlled access area until issued for use.
4.6.4 Fastener documentation shall be controlled.
Note: it is recommended that external packaging marking includes part number,
lot number, and supplier name.
NASA-STD-8739.14 – 2020-06-02
Page 16 of 16
Table 1: Fastener Quality Control Requirements and Sampling Level
Quality Controls
Quality Control Level
Level I Level II Level III
Pro
cure
men
t
Pro
vis
ion
s
Supplier Qualification Qualified Qualified Nonqualified Qualified or Nonqualified
Traceability Level Complete Complete Incomplete Complete Incomplete Complete or
Incomplete
CoC Required Required Required Required
MTR Required Required Required Optional
Rec
eiv
ing
Insp
ecti
on
Dimensional Inspection1 System 22
100%
System 212
Sample Size C
System 212
Sample Size B
System 212
Sample Size B
System 212
Sample Size A
System 212
Sample Size B
Visual Inspection for Finish Sample Size B Sample Size C Sample Size B Sample Size B Sample Size A Sample Size B
Visual Inspection for Uniformity 100% 100% 100% 100%
Chemical Analysis Optional Optional Sample Size C Sample Size B Sample Size A3 Optional
Tensile Testing4,5 Optional Optional Sample Size C Sample Size B Sample Size A Optional
1: Dimensional inspection is only applicable to threaded fasteners. 2: System 22 may be performed as a substitute for System 21 per ASME B1.3-2007, using the same sample size.
3: Chemical analysis must be performed using a quantitative method (Section 4.5.6.2)
4: Tensile testing is only applicable to threaded bolts, screws, nuts, and nutplates 5: Fasteners smaller than #10 or shorter than 2 times the diameter may not be capable of meeting this requirement.
Table 2: Sampling Size and Acceptance Criteria
Lot Size Sample Size Acceptance Criteria
A B C
1-2 2 1 1 0 failures
3-15 3 2 2 0 failures
16-25 4 3 2 0 failures
26-50 5 4 2 0 failures
51-90 6 5 2 0 failures
91-150 7 6 2 0 failures
151-280 10 7 2 0 failures
281-500 11 9 3 0 failures
501-1200 15 11 3 0 failures
1201-3200 18 13 3 0 failures
3201-10,000 22 15 4 0 failures
10,001-35,000 29 15 4 0 failures
35,001-150,000 29 15 5 0 failures
150,001-500,000 29 15 6 0 failures
500,001+ 29 15 7 0 failures
Note: Receiving inspection sample size and acceptance criteria are designed to
meet/exceed ASTM F1470−19, Standard Practice for Fastener Sampling for Specified